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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bafd0fa48d871196fb91a52d03669f27dfa44490a18f31a99dabfbd594d25c2d' 
  AND token = 'ngTPNgBg80Vnwb9PiEhbMJxVHkowSTGtk5dGySLA+AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}